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Title "RSA_public_encrypt 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
RSA_public_encrypt, RSA_private_decrypt - RSA public key cryptography Header "SYNOPSIS" .Vb 1 #include <openssl/rsa.h> \& int RSA_public_encrypt(int flen, unsigned char *from, unsigned char *to, RSA *rsa, int padding); \& int RSA_private_decrypt(int flen, unsigned char *from, unsigned char *to, RSA *rsa, int padding); .Ve Header "DESCRIPTION" \fIRSA_public_encrypt() encrypts the flen bytes at from (usually a session key) using the public key rsa and stores the ciphertext in \fBto. to must point to RSA_size(rsa) bytes of memory.

\fBpadding denotes one of the following modes:

Item "RSA_PKCS1_PADDING" \s-1PKCS\s0 #1 v1.5 padding. This currently is the most widely used mode. Item "RSA_PKCS1_OAEP_PADDING" EME-OAEP as defined in \s-1PKCS\s0 #1 v2.0 with \s-1SHA-1, MGF1\s0 and an empty encoding parameter. This mode is recommended for all new applications. Item "RSA_SSLV23_PADDING" \s-1PKCS\s0 #1 v1.5 padding with an SSL-specific modification that denotes that the server is \s-1SSL3\s0 capable. Item "RSA_NO_PADDING" Raw \s-1RSA\s0 encryption. This mode should only be used to implement cryptographically sound padding modes in the application code. Encrypting user data directly with \s-1RSA\s0 is insecure.

\fBflen must be less than RSA_size(rsa) - 11 for the \s-1PKCS\s0 #1 v1.5 based padding modes, less than RSA_size(rsa) - 41 for \s-1RSA_PKCS1_OAEP_PADDING\s0 and exactly RSA_size(rsa) for \s-1RSA_NO_PADDING.\s0 The random number generator must be seeded prior to calling \fIRSA_public_encrypt().

\fIRSA_private_decrypt() decrypts the flen bytes at from using the private key rsa and stores the plaintext in to. to must point to a memory section large enough to hold the decrypted data (which is smaller than RSA_size(rsa)). padding is the padding mode that was used to encrypt the data.

Header "RETURN VALUES" \fIRSA_public_encrypt() returns the size of the encrypted data (i.e., RSA_size(rsa)). RSA_private_decrypt() returns the size of the recovered plaintext.

On error, -1 is returned; the error codes can be obtained by ERR_get_error\|(3).

Header "CONFORMING TO" \s-1SSL, PKCS\s0 #1 v2.0 Header "SEE ALSO" \fIERR_get_error\|(3), rand\|(3), rsa\|(3), \fIRSA_size\|(3) Header "HISTORY" The padding argument was added in SSLeay 0.8. \s-1RSA_NO_PADDING\s0 is available since SSLeay 0.9.0, \s-1OAEP\s0 was added in OpenSSL 0.9.2b.